<svg xmlns="http://www.w3.org/2000/svg">
  <defs>
    <g display="none">
      <marker id="testMarker" markerWidth="100" markerHeight="100" style="display:inherit">
        <rect width="100" height="100" fill="green" />
      </marker>
    </g>
  </defs>
  <path d="M 10 10 L 0 0" marker-end="url(#testMarker)" />
</svg>